MC33035DW ON Semiconductor, MC33035DW Datasheet - Page 17

• Manufacturer Part Number: MC33035DW
• Description: IC CTRLR DC MOTOR BRSHLSS 24SOIC
• Manufacturer: ON Semiconductor
• Type: Brushless DC Motor Controllerr

Specifications of MC33035DW

• Applications: DC Motor Controller, Brushless (BLDC)
• Number Of Outputs: 1
• Current - Output: 100mA
• Voltage - Load: 5.9 V ~ 6.5 V
• Voltage - Supply: 10 V ~ 30 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-SOIC (7.5mm Width)
• Operating Supply Voltage: 10 V to 30 V
• Supply Current: 20 mA
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Three Phase Motor Commutation
full−featured open loop motor controller with full wave, six
step drive. The upper power switch transistors are
Darlingtons while the lower devices are power MOSFETs.
Each of these devices contains an internal parasitic catch
diode that is used to return the stator inductive energy back
to the power supply. The outputs are capable of driving a
delta or wye connected stator, and a grounded neutral wye
if split supplies are used. At any given rotor position, only
one top and one bottom power switch (of different totem
poles) is enabled. This configuration switches both ends of
the stator winding from supply to ground which causes the
current flow to be bidirectional or full wave. A leading edge
spike is usually present on the current waveform and can
cause a current−limit instability. The spike can be eliminated
by adding an RC filter in series with the Current Sense Input.
Using a low inductance type resistor for R
The three phase application shown in Figure 36 is a
R
C
T
Fwd/Rev
60°/120°
T
Enable
V
Speed
Set
M
Faster
22
17
18
11
12
13
10
4
5
6
3
7
8
Error Amp
Reference
Regulator
Oscillator
25 μA
Figure 36. Three Phase, Six Step, Full Wave Motor Controller
PWM
Undervoltage
Lockout
Shutdown
Thermal
S
Gnd
Decoder
Position
will also aid in
R
S
S
R
Rotor
SYSTEM APPLICATIONS
Q
Q
16
MC33035, NCV33035
http://onsemi.com
17
spike reduction. Care must be taken in the selection of the
bottom power switch transistors so that the current during
braking does not exceed the device rating. During braking,
the peak current generated is limited only by the series
resistance of the conducting bottom switch and winding.
If the motor is running at maximum speed with no load, the
generated back EMF can be as high as the supply voltage,
and at the onset of braking, the peak current may approach
twice the motor stall current. Figure 37 shows the
commutation waveforms over two electrical cycles. The
first cycle (0° to 360°) depicts motor operation at full speed
while the second cycle (360° to 720°) shows a reduced speed
with about 50% pulse width modulation. The current
waveforms reflect a constant torque load and are shown
synchronous to the commutation frequency for clarity.
Brake
23
I
Limit
I
peak
14
2
1
24
21
20
19
9
15
+
C
R
Fault
Ind.
switch
V
Q
Q
3
M
6
R
V
) R
) EMF
M
Q
Q
2
5
winding
Q
1
Q
R
4
S
A
B
C
S
Motor
N
N
S